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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3ff2a85eef9bcac672bb0f4df2eac4df644fc012b19d23a63e4f7cddbf02ee3b' 
  AND token = 'w9hHfoRk6b6rriEu8Evp5J2cD8BZ8KTRTTFTioTTXgM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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