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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ae41f6ffdb9ed84028db48021b9a0cb7a033a94bd6b9c7e339f45d351afed9d8' 
  AND token = 'NmZvi3NVgyM2Vf1pkZ7EXErkpi2w895cjJDrleke6Uw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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