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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '97fe3f5ae4917611f09d267ee77dc96e4ac2712509ff490823fd076de139e855' 
  AND token = 'OAkfXTkWEkQXscyGvg53h3RYg5TzJx+DVd7YBvLY9f4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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