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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '51e932a8ac787703155b8aebfd24ec82870ac0d92829f02a763f55ad6a619d30' 
  AND token = 'xTJ18FgAj88pDbgc7d0WqszeWCDGM5ybM5TVbkdh9e0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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