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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'be793dc84aac7124e411680d5f28c9bba2599937bab92d13571e0aabd6e762aa' 
  AND token = '4ilhsmq1qhxPhq3NRh+yVRFKSI+AmEU/GKl5Kr5dHNI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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