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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '860303b63fd446f638e426df5567b565f39210e46430e22731180cac4180383a' 
  AND token = 'yL4BYpC7YjhO2T0AmMqJWbG3R1Kmf/oTFgFxkntT1WQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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