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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '93b178d23695a9cfcf121f3f554308764baaaaf3adffa111cfa04ab98a44c7d2' 
  AND token = '1AphGt6tk1J5h0Q5yyVV/zbGki/em7B61CyRx36lLzQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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