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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '77f7b1398f020544dab674e6ebbedb39ed56ce17ac5414b9a247aa04406f815a' 
  AND token = 'y/Fh+T9lwzc8Xr9eKAyAMzmQDo9bXKdTypFEP+Dj9S0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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