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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b42c88e9f35d8b6fe7a82d0b8f8ccef85953fa41b902ace3cf72bea7b66af3e6' 
  AND token = '5iIm3+UNHLXBGIyka7DF6HoXXa6k4rHQWV7illiGYTY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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