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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a7dc42a26f8a6b6e7e45c4db765bcfbbecc576fc143c5c8157f688dee82ce777' 
  AND token = 'B0lMNztfax1osKjQHMlQLJCpSmag+POJJ1HZ2X2zTjU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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