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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '57700b5c2bd02237fad4cd2540a7c5ad59833cd7c1ab26fce25fb17e968db133' 
  AND token = 'J271I61yHFN+yGD+R3FNrMtfKDoRJZTN5yeyYJh0s3I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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