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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd3abec9f303cf0e0423ba9bc6768dea619b708f6bbc44044c4b11f0417c9161d' 
  AND token = 'BZtbtK/QoHpmJOcJ300TMU9BJsqBy9rSW2M9dUMceEY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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