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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a753901d16e75ea5649cd611dcaa258dcde75f7066bc776f4da6f524eea87681' 
  AND token = '7FOOn7XwdM9WwnZGg6Kn6/hxuMCgnViKtyye8L69aro=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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