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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '47581c82b104fc12490c7c47b23ac881702a0025b398651009d4f25ef3028b22' 
  AND token = 'kkwWqlQM6pv2O0etE1kpebXEoflHPOEDZVsdMsvBr3I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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