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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e62c8b8d94f5f13b5f7938eb7318f7ef4304192d1f758f6394a2dba9245a559b' 
  AND token = 'gdMcby9bzIr/uALXcFOKGsIiuz3SLfI0lH8S6Fq18AY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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