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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a155ac7d91c59d682048ad280b924cc8a80932e0a8e895a4dba299a37b8c09b4' 
  AND token = 'xNOMLd9vcn34qZ1Oqt2XlAPIEYSqZXOLClsA8x7+D6w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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