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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f0d062c8d9de5185a8b6f6ea1d5ecc3663142b3306201a228d9585e4a1b765fc' 
  AND token = '4Tc6sotD0d6mlfaaDopdAQF0iVTVJn6fruYuDGgAmk8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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