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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '93c242d1598f3129f2f4750823df96661a73e4f5b7b601635083fe3ddcc85eca' 
  AND token = 'SN3qnotIhFpUMU+6adVS1mtfSMr9XjHp0l2KM5KWBtA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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