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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e47c165417c32c550b9594db3fd4299cd598f3211fd1025e28fcc71290770399' 
  AND token = 'nbG/oDHWxwuD0KJgv40Cq1UCG7xs6rVmJ9cJyWgLk68=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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