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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9af5438f67470b4342acdf04a07d8ad138aef4104a65ff0f1d04234a0d2819e9' 
  AND token = '448Pzk0Anu/0QqzcwmGPRbVCgNK0u7NHo01MhjwTW1g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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