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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '91d1f8d718b1562ee8f93a4b45ff18e28318fe8f814d34e60e5d530f0d222df3' 
  AND token = 'hvAJrIy5EmXDXCY0+Y9tW1gHnHzk015xJ3mczM9Xdqc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}