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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4eed54b003d83a5d1b14d4421a672fe2f574348a2e81effd448173de641a7cea' 
  AND token = '0yqrdtoKsJa5/eIg5JCnF/ySBoGuyX0nYBlKKGjL1mE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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