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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1525acd99468027c2f4b1c6d6cd666057102effdc78f83a98e71054ec1867d9b' 
  AND token = 'q6vCt94NN8bUAoGq2/99aLGNzFv7x/5h1jM1sZwOwcE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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