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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e44958bcbc5222ac96771c637673bb9975ad4dead1d3306bdaee53c3ae7fd513' 
  AND token = 'oZatZ068cp5QaGQLCCeI3AA2d+nn4O5IJyFGW2/Bil0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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