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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '750ecdff218235a46894e8af2f98b48d93b6ba38a4640df0b3ab46bc5b41147b' 
  AND token = 'gi8lai2pGfKpM8Ue7PTKqeQAsxcr8AY6T+d4P3s18Hk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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