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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '93e29e769e6f61ee051830e350d6de99cb400cc13ce2e780a091086cb0916668' 
  AND token = 'xchTKcD0Pr6w3gt0qWOIyPffsvFBHt0SlNq88X2X2Rs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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