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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9aeb1bc439ce50a0c4a8df868a189da733ccd413e2ee8c27cac33d69cafc1ba3' 
  AND token = 'S7Y0ev8cLl/RP4B6JK+SkOIF0b0+17DQsQv9uxI/7rw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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