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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1ee9cf9e19d8d08b8519fb20fb095b3f3a7c0f9ef102979fbbaa35dfdd4390c3' 
  AND token = 'WoRAkcNMOp0jPyLQHcyh4eLi0eS8r+02bosRSszymak=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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