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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb86e29b6cdadf54ab88fd6793484bfe801f00a2c8c59f0af3fab71b2b9ec027' 
  AND token = '0pK+21gKtgY2RiQVyd3THGMlTNESv/Adaa/0DZVw4Ss=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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