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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9df2c05df64747ae57476f591e5d0fe43fc9d0045224730e6041601a57154878' 
  AND token = '0Zwcezzt0Fa4fGdEVRo/K8GhhmEZj9EvErcM4HOzymM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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