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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b9ddd85a0da7c7fb84379689a0861dfae2240956a8c5672e0c42a2772b19789d' 
  AND token = 'EDfEWjLalqxTgMxn7r91HP9QdAJCaMXaxLjcDXQitN4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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