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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '76feeac3702a74041f7fb73892e4e3e343db31fc4af4175abc929be7788a7eef' 
  AND token = 'vGap1uplj7CSue91SuI9xOePQM2hwPnw218TLYHGLQU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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