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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7963180c759a7ebd3d5e596a9050f2d8bc5d9f213c7e16c2d8f8349e6771f25c' 
  AND token = 'oLKvkHc8rsxEXKGDxc1G9ewkM3Zp9hI83cKh5Tvcrzg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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