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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '95f724cef48e042ce3b30657ff22b5dbfa9e65a59a40420705228c477343e804' 
  AND token = '1L7+OowS/hstwluY5E1NaTwaD07at2iX6TcFG2Rs61Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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