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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6ee247036c98920ef01eb3099c63c7b6ce9d3d76adc50325c41b2dd401975127' 
  AND token = 'U+Kletz2wRq+Z8YPIwbaTq5v920hzl2tLdtYIkgrXlI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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