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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd35808957f27d726ac0e3a2e0cbb82ff3269f6cb1c28c11093f781b8a05b4e1' 
  AND token = '3plCOeNlB7M0qoasg1str45cylFN7NXwe66A9/ID6H4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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