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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '661d7fcb3dff11d6f99d3348c239e2c6ac893277e0dd38401135a90a89c7f77f' 
  AND token = 'zyHc8MATutdablPmgzLPhJItpymQ/T4c3vfi5Jmk3mg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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