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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd108bdd7430b74ae139176b82c2e4af28f005f5d2831197d4cfcf2600405819' 
  AND token = 'xDcDIs7TiSSm/d953QWVMgfKiWLSds0zi4Kb7RA62vk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00075

JSON explain

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