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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2a69944578841257323dac92008a97ac5a6bca87708c01aece66b4636bdc6793' 
  AND token = 'gl6+H53icWFBSLiZWcO1MV/9RqBnahWsPWFrh2yywUU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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