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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '67b7882b26d4266c21cbc1bc6ab06b606759ac3eaff464b429f30b3491f3dcbb' 
  AND token = 'jA+xNaEFgd9GuNkSapuh1wRjEDeFbS4yVzxvPrjuBrI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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