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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '82f8ad4e810d8b664b88deee87788b42a7bd5efa722a45f9613f05c3dd8949cc' 
  AND token = 'zIBaseWQX1WcxZm2tqqje0XoQ/8Mk8CBDBZOmBXIeYg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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