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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fb26ccd939d17bf81d63145d5fa61d43e578b78012cfd5ab097fba32fa86f928' 
  AND token = 'FZz3EFdEtOIKfTTHMfHap+GClU1jlX2NMvP8D1iF6p4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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