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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0b53bfc075964482097d22c3f9999c4e52b0e43a0d76d71951954d32cc96ba2d' 
  AND token = 'exffufwQKR+TwbInvBiT9EKjqev0lNfIbS4tKYoFxIo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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