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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c8ec044597ec9d543663a920b7aeaaa56e8d6f43fa8bd31df3dbc0ca909a2b1e' 
  AND token = 'SYLfCU+1doL/NOqKML1Uk1t8fXaQAoh61xQqJyf5H2U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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