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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd3db36075dc5d3c687b2d4d7d513825a766e71f6a806342184abe7e328f8878c' 
  AND token = 'xFt+PSRvqa9rFk6KqGzGRkfDE2f50J2j8GMTBWxHKpk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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