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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '185d3cd0f33b9c00703769c863f3b74b4fe4beb5cdc755479cd9877844b7bff9' 
  AND token = 'RnkpmV0BAEDqvAMmJD9KfYqo5wwKI9B5LLyXywWN/ro=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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