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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e70890ed99cd02302cbf5f99706a8e4a92900abae0ccb62f35460a584025059f' 
  AND token = 'P7wLgDdcSJdW+p46rqSTrAW3mCkt4Y2+lvKhxd9qI7Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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