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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '92174aa10d7b58ea614f0e7e0853a80fe49c2f21739942887973838037a592a6' 
  AND token = '90ItauFcUyOuPz6X3VXLUP90a4q9JYIubCqlCPTRuYk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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