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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f0873cbbb840e070c34305cc5cd553e8fad17febaa7977c67efbb1429d92527b' 
  AND token = 'yPgqUVsb9OtiRDsXxfoSwbyiCH7I88Im7ArFu5yH7So=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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