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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a9853b2270ead5d49da21b6bd9767c757cd78b7cf7fb555940ad06bae1d7efd0' 
  AND token = 'F1Cxo93SirEJT/QHUglhhU2ZNygG5/J6bFmF+6TCSQo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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