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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e086bb6a48c9d07e8c6802638f906de2dd9193ce8b0b20eab94432f69eb3de79' 
  AND token = 'pXS3GwFgr032rMV4H3q58eQHeBGPa/gfyp2uTGleR9A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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