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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cfaceab96cc747ca5b62c0e3ecb51b7ccaa08735a675b2182d0cca5e0d1103ae' 
  AND token = 'Iqyp3WH3GBCP4gMv8wFo5AGvzp/xjvKtaNV2CpppCfs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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