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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '879558b350793d46aeef673a5e2a7a5d8c915fca49c0ed2f1abd8bcffcdfece5' 
  AND token = 'GyY5c5+d6kFlp/3uB5wHIT08i7RMl24Xqvfljq6Syog=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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