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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a58aa315f7af37a31e17eca866c45715c76090fdfd3573b19bc08d803764192f' 
  AND token = 'FTOCFvDP+rQriPs8bVu0Y9n+VvK31cAg2Ope3xcaTm4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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