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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ad9e3fc44d5977c4589ef494052cdba0d4dd10e0066050c1febe652172b073de' 
  AND token = '1lX0Nxx4haKNs4OXO2ae40rZh181fuGVvhmef13XLZ0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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