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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd3441071c7e172e6f9e90dead2e221372dde169cfc59c7cb4034321fc5e76913' 
  AND token = 'NrEP3hoUJ2/K8RTLTzl7BaWwBISyv8Qt1tApBbuOIfA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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