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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '65c89aab5ab763e1ab4239e1145e5a2881117d96936934357cccb6851b74920b' 
  AND token = 'uWTXCSie4FsPfRsgUNsjvfZhYMeH9zLImtdH0aK0Qgs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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